The man who died in the crash has been identified as 62-year-old John Klein of Waianae. Police believe he was headed west on Farrington Highway.

Witnesses told police they saw the man weaving on the road and nodding his head, leading traffic officers to think the driver may have had a medical problem or was driving drowsy.

Investigators determined the man quickly veered from the left lane of the highway to the Ko Olina off-ramp without slamming on his brakes, as there were no skid marks on the road.

The truck didn't make it to the off-ramp though, instead it shot up a grassy embankment.

There are tire marks for where the truck went up the small hill, but there are no marks on the ground around the tree. Investigators said that shows the truck was airborne when it slammed into the tree.

Because the crash was just off the highway, the major West Oahu road and the off-ramp remained open. Traffic still backed up around the accident, as drivers slowed down to get a glimpse of the mangled truck. Some of the truck parts were strewn around the ground, along with a pallet of tile the man had been hauling.

Those passing by could not see the body of the driver which remained stuck inside.

After the violent crash, officers said the man died in his truck.

Fire crews originally responded and braced the truck in its precariously balanced position around the tree. They later needed to nearly cut the vehicle in half to get the man's body out.

The medical examiner may release the driver's identity Wednesday, but the exact cause of the fatal crash along Farrington Highway could take days.

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